20091113 is out now. The main change is in the syntax highlighting implementation: while by and large it shouldn't be noticeable, there are a few situations where it results in a big performance increase: notably making syntax changes at the top of large files (eg., starting a block comment), and doing a find and replace that has an effect on the syntax.

There's also a few improvements to .sublime-build files (details forthcoming), as well as miscellaneous changes and improvements. Finally, view groups have been exposed to the API, so views can be reordered by plugins.